This isolated tribe is living on North Sentinel Island in the Indian Ocean and doesn’t want to have any contact whatsoever with modern society and is very hostile to strangers. They didn’t develop agriculture and live off hunting and gathering like all humans did before developing agriculture thousands of years ago. Very few photos of them that exist were taken far from shore or from the air as they greet everyone with arrows. Unlike other isolated tribes that are hidden away like those in the Amazon Rainforest, this tribe, called the Sentinelese, has been known to us for centuries, but they have always rejected any contact with us.

Australian comedian and radio host Hamish Blake visited an Amazon tribe and tried their crazy ritual which consists of putting your hands in gloves filled with bullet ants (paraponera clavata), a species of ant named on account of its powerful and potent sting that lasts for 24 hours.

The pain is ranked as the most painful according to the Schmidt sting pain index, given a "4+" rating, above the tarantula hawk wasp and, according to some victims, equal to being shot, hence the name of the insect.

These photographs were obtained by Survival International show uncontacted Indians in detail. This tribe lives in Brazil, near the Peruvian border. It was featured in the “Jungles” episode of BBC1’s “Human Planet” in the United Kingdom.